Public Information Statement
Issued by NWS Mt. Holly, NJ

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NOUS41 KPHI 041300
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PAZ054-055-060>062-070-071-101>106-050300-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
800 AM EST TUE NOV 4 2014

...THE WEEK OF NOVEMBER 9TH THROUGH 14TH IS WINTER WEATHER
AWARENESS WEEK IN PENNSYLVANIA...

EACH DAY WE WILL FEATURE A DIFFERENT EDUCATIONAL MESSAGE CONCERNING
THE DANGERS AND SAFETY CONCERNS ASSOCIATED WITH WINTER WEATHER.

TODAY`S MESSAGE...
TYPES OF HEAVY SNOW EVENTS WHICH IMPACT PENNSYLVANIA

HEAVY SNOW CAN IMMOBILIZE A REGION AND PARALYZE A CITY...STRANDING
COMMUTERS...CLOSING AIRPORTS...STOPPING THE FLOW OF SUPPLIES...AND
DISRUPTING EMERGENCY AND MEDICAL SERVICES. ACCUMULATIONS OF SNOW CAN
CAUSE ROOFS TO COLLAPSE AND KNOCK DOWN TREES AND POWERLINES. HOMES
AND FARMS MAY BE ISOLATED FOR DAYS AND UNPROTECTED LIVESTOCK MAY BE
LOST. THE COST OF SNOW REMOVAL...REPAIRING DAMAGES...AND THE LOSS OF
BUSINESS CAN HAVE SEVERE ECONOMIC IMPACTS ON CITIES AND TOWNS.

HEAVY SNOW CAN BE PRODUCED BY NOR`EASTERS...BLIZZARDS AND OVERRUNNING
SITUATIONS. LESSER AMOUNTS OF SNOW ARE OFTEN PRODUCED BY ALBERTA
CLIPPERS.

NOR`EASTERS ARE INTENSE AREAS OF LOW PRESSURE THAT TYPICALLY
DEVELOP ALONG THE EASTERN SEABOARD MOST OFTEN DURING THE LATE
FALL...WINTER AND EARLY SPRING. THEY USUALLY BRING STRONG NORTHEAST
WINDS TO AREAS NEAR THE COAST AS THEY MOVE NORTH ALONG IT. SOME
MEMORABLE NOR`EASTERS IN RECENT YEARS INCLUDED THE PRESIDENT`S DAY
SNOWSTORM OF 2003...THE FEBRUARY 11TH AND 12TH SNOWSTORM OF 2006...THE
VALENTINE`S DAY SNOWSTORM OF 2007 AND THE SNOWSTORM OF FEBRUARY 25TH
AND 26TH...2010. SNOWFALL RATES IN NOR`EASTERS CAN REACH 2 TO 4
INCHES PER HOUR AND THESE RATES CAN LAST FOR SEVERAL HOURS.

OVERRUNNING CAN ALSO PRODUCE HEAVY SNOW. THIS OCCURS WHEN WARM AIR
ALOFT FLOWS OVER COLD AIR NEAR THE SURFACE. OVERRUNNING HAPPENS
MOSTLY DURING THE WINTER WHEN THE CONTRAST IN AIRMASSES IS GREATEST.
OVERRUNNING OCCURS MOST OFTEN WHEN A LARGE DOME OF HIGH PRESSURE IS
LOCATED IN SOUTHEASTERN CANADA AND A WARM FRONT IS APPROACHING OUR
REGION FROM THE SOUTH OR SOUTHWEST.

AN ALBERTA CLIPPER IS AN AREA OF LOW PRESSURE THAT USUALLY DEVELOPS
OVER THE PROVINCE OF ALBERTA IN CANADA...EAST OF THE ROCKY
MOUNTAINS. ALBERTA CLIPPERS USUALLY MOVE VERY QUICKLY SOUTHEAST FROM
THEIR POINT OF ORIGIN AND USUALLY BRING ONLY LIGHT SNOW AS THEY
CROSS OUR REGION UNLESS THEY INTENSIFY OFF THE EAST COAST. THEY ALSO
ALLOW COLDER AIR FROM CANADA TO MOVE INTO OUR REGION IN THEIR WAKE.

SOME SNOW TERMS WHICH ARE COMMONLY USED INCLUDE BLIZZARD...BLOWING
SNOW...SNOW SQUALLS...SNOW SHOWERS AND SNOW FLURRIES.

A BLIZZARD IS A WINTER STORM WHICH HAS SUSTAINED WINDS OR FREQUENT
GUSTS OF 35 MPH OR MORE...WITH CONSIDERABLE FALLING AND OR BLOWING
SNOW FREQUENTLY REDUCING THE VISIBILITY TO AT OR BELOW ONE QUARTER
MILE...AND THESE CONDITIONS LAST FOR 3 HOURS OR MORE. SOME OF THE
GREATEST SNOWFALLS ON RECORD IN PENNSYLVANIA OCCURRED DURING
BLIZZARDS. 1 TO 2 FEET OF SNOW FELL OVER A LARGE PART OF
PENNSYLVANIA DURING THE BLIZZARD OF 1993.

BLOWING SNOW IS WIND DRIVEN SNOW THAT REDUCES VISIBILITY. BLOWING
SNOW MAY BE FALLING SNOW OR SNOW ALREADY ON THE GROUND THAT IS
PICKED UP BY THE WIND.

SNOW SQUALLS ARE BRIEF INTENSE SNOW SHOWERS ACCOMPANIED BY STRONG
GUSTY WINDS WHICH MAY PRODUCE SIGNIFICANT SNOW ACCUMULATIONS.

SNOW SHOWERS HAVE SNOW FALLING AT VARYING INTENSITIES FOR BRIEF
PERIODS OF TIME WITH SOME SNOW ACCUMULATION POSSIBLE.

SNOW FLURRIES ARE LIGHT SNOW WHICH FALLS WITH LITTLE OR NO SNOW
ACCUMULATION.


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